The need for clinical trials.
D000759:Adjuvants, Anesthesia; D000758:Anesthesia; D000818:Animals; D002415:Cats; D002986:Clinical Trials as Topic; D004285:Dogs; D004358:Drug Therapy; D006168:Guinea Pigs; D006805:Human Experimentation; D006801:Humans; D011817:Rabbits; D012106:Research
D000759:Adjuvants, Anesthesia